HJG Simple demo of Tk: label, entry, button and a picture. Layout with frames and pack. No error-checks on input (empty, non-numeric) or overflow of result.
#!/bin/sh
# Restart with tcl: -*- mode: tcl; tab-width: 4; -*- \
exec wish $0 ${1+"$@"}
# EntryDemo02.tcl - HaJo Gurt - 2006-02-02 - http://wiki.tcl.tk/15398
#: Tk-Demo: Enter 3 numbers, show sum and product
package require Tk
proc Calc {} {
#: Calculate results / !! No error-checks !!
global A B C P S
set S [ expr { $A + $B + $C } ]
set P [ expr { $A * $B * $C } ]
}
frame .f1 ;# Frame for Input-fields + button
frame .f2 ;# Frame for Output
label .labA -text "A:"
label .labB -text "B:"
label .labC -text "C:"
label .labS -text "S="
label .labP -text "P="
entry .entA -textvar A -width 11
entry .entB -textvar B -width 11
entry .entC -textvar C -width 11
entry .entS -textvar S -state readonly
entry .entP -textvar P -state readonly
button .ok -text "OK" -command Calc
pack .f1 .f2
pack .labA .entA -in .f1 -side left
pack .labB .entB -in .f1 -side left
pack .labC .entC -in .f1 -side left
pack .ok -in .f1 -side left -padx 10
pack .labS .entS -in .f2 -side left
pack .labP .entP -in .f2 -side left
#package require Img ;# Images other than .gif
image create photo Pic1 -file "tcl.gif"
label .labPic1 -image Pic1
pack .labPic1 -padx 4 -pady 4
set A 2147483647
set B 0
set C 1
Calc
bind . <Return> Calc
wm title . "EntryDemo2"
focus -force .entAIs there a simple/portable way to check for overflow ?